Rexnord Gmbh

Kelley Company, Inc.

Asi Technologies, Inc.

Kelly Company, Inc.

Dennis L Carlson

Richard D Cultice, Jr

Charles A Zimmermann

An air curtain providing an air stream across a doorway between areas of relatively cool and warm air masses and continuously monitoring the condition, e.g., temperature, pressure and flow rate, of one or both air masses and the air stream. The air curtain has a control system including an electronic controller operating a heater and fan and receiving air characteristic inputs from temperature, pressure and flow rate sensors. The controller monitors these inputs continuously and processes them to operate the heater and fan according to algorithms designed to minimize air cross-filtration and energy consumption while maintaining the temperature and humidity of the air stream at a point substantially along a line representing the mixing of anteroom air and the air stream that is substantially tangent to the psychrometric saturation curve. A method of maintaining a non-saturated air stream across a freezer doorway, so as to prevent condensation and reduce the formation of fog and frost at the doorway, is also disclosed.

Apparatus and method for providing continuous real-time conditioned air curtain

An industrial door comprising a pair of side panels and a pair of central panels with each central panel having approximately twice the horizontal width of a side panel. The upper end of one side edge of each side panel is pivoted to the jamb of a doorway, while the upper end of the opposite side edge of each said panel is pivoted to the adjacent side edge of a center panel. A track is located above the doorway and a pair of trolleys are mounted for movement on the track. Each trolley includes a vertical pivot shaft which is connected to a center panel at a location midway of the width of the panel. A drive mechanism is mounted in the header and includes an endless cable which is connected through a torque arm to the shaft of each trolley. Operation of a reversible drive mechanism in one direction will operate through the cable to move the panels to a closed position where they enclose the doorway, while operation of the drive mechanism in the opposite direction will move the panels to the open or folded position. Flexible weather stripes can be connected between the side edge of each said panel and the door jamb, and similarly flexible weather strips can interconnect the adjacent side edges of the side panels and center panels. To ensure that the panels fold in the proper manner, resilient shock cords interconnect the adjacent side edges of the side and center panels.

Bi-fold door construction

A vehicle restraint for preventing a vehicle or truck from accidentally pulling away from a loading dock. The truck restraint comprises a frame to be mounted on the vertical front face of the loading dock and a restraining member is mounted for pivotal movement in a generally vertical plane parallel to the dock face between a first lower storage position and a second operative position where the restraining member will prevent outward movement of the truck away from the dock. A curved plate or abutment is mounted in spaced relation to the frame and extends throughout the length of the path of pivotal movement of the restraining means. The restraining member is normally disposed out of contact with the abutment as the restraining member pivots between the storage and operative positions. In the event the truck attempts to pull away from the loading dock while the restraining member is in the operative position, the outward force applied by the truck to the restraining member will deflect the restraining member outwardly into contact with the abutment to thereby restrict further outward movement of the restraining member. The restraining member is urged to the operative position by a resilient biasing member and the biasing member is movable between a first position where the force of the biasing member overcomes the weight of the restraining member and acts to urge the restraining member to the operative position, and a second position where the force of the biasing member is overcome by the weight of the restraining member so that the restraining member will move by gravity to the storage position.

Vehicle restraint

A semi-rigid elastomeric cover for a roller chain coupling which comprises a generally cylindrical center portion having its radial interior contoured to relatively tightly fit the contour of the roller chain and two opposed axially extending flanges connected to the center portion each flange terminating in a circular beaded portion dimensioned for a compression fit with the hub of the coupling.

Growing community of inventors

Waukesha, WI, United States of America

Dennis L Carlson